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Additional information
Translated from Sibirskii Matematicheskii Zhurnal, Vol. 11, No. 5, pp. 971–987, September–October, 1970.
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Vodop'yanov, S.K. Estimates of the deviation from a sphere of quasiumbilical surfaces. Sib Math J 11, 724–735 (1970). https://doi.org/10.1007/BF00967832
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DOI: https://doi.org/10.1007/BF00967832